HOW OFTEN SHOULD THE FUEL FILTER BE CHANGED ?

1993 Toyota Corolla

If someone can tell how often do I change the fuel filter on 1993 Toyota Corolla 1.8 efi twin cam. Haven't had mine changed in a long time. I was told by a mechanic it was self cleaning, that is why it wasn, t done.I thought to ask if you guys can tell me if that is true or not. Thankyou.